Propagation behavior of acoustic wave in wood

Xu, Huadong; Xu, Guangbiao; Wang, Lihai; Yu, Lei

doi:10.1007/s11676-014-0506-6

Cited by 13 publications

(5 citation statements)

References 7 publications

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“…The stress waves used in the field of NDT of wood are mostly shock stress waves generated by hammering (Xu 2011). The propagation of stress waves in wood is influenced by properties, direction, and microstructure of wood.…”

Section: Theory Of MC and Wood Property Indexes Based On Ndtmentioning

confidence: 99%

Theoretical and experimental research on moisture content and wood property indexes based on nondestructive testing

Cheng

Dai

Yang

et al. 2020

BioRes

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A set of reformulated theoretical formulas was developed to measure the relationships between moisture content (MC) and stress wave propagation velocity, dynamic modulus of elasticity ( “E” _”d” ), and modulus of stress-resistograph of the wood. The theory of wood science, elastic mechanics, wave science, and stress wave propagation were used as the theoretical basis. Using larch as the material, both stress wave and micro-drilling resistance technologies were used to study the timber property changes under different moisture contents. The results showed that when the MC of wood did not reach the fiber saturation point (FSP), the wood property decreased sharply with increased MC. However, the study also found that when the MC of wood was higher than the FSP, the wood property decreased with increased MC. In addition, the experimental results showed that the variation trend calculated by the new set of theoretical formulas was consistent with the numerical variation trend measured by the experiment, and the coupling effect of stress wave and micro-drilling resistance was high. This set of theoretical formulas can provide a reference for the research on nondestructive testing and performance evaluation of ancient building timber.

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Section: Theory Of MC and Wood Property Indexes Based On Ndtmentioning

confidence: 99%

Theoretical and experimental research on moisture content and wood property indexes based on nondestructive testing

Cheng

Dai

Yang

et al. 2020

BioRes

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“…Wave propagation in wood is a complicated dynamic procedure controlled by the properties, orientation and microstructure of the fiber, and perhaps more importantly, by the geometry of the material [28]. As a result, accurate modelling of wood materials is the priority issue to get insight into wave propagation behaviour in wood poles.…”

Section: Modelling Of Wood Materialsmentioning

confidence: 99%

Numerical Study on Guided Wave Propagation in Wood Utility Poles: Finite Element Modelling and Parametric Sensitivity Analysis

Yan

2017

Applied Sciences

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Abstract:Recently, guided wave (GW)-based non-destructive evaluation (NDE) techniques have been developed and considered as a potential candidate for integrity assessment of wood structures, such as wood utility poles. However, due to the lack of understanding on wave propagation in such structures, especially under the effect of surroundings such as soil, current GW-based NDE methods fail to properly account for the propagation of GWs and to contribute reliable and correct results. To solve this critical issue, this work investigates the behaviour of wave propagation in the wood utility pole with the consideration of the influence of soil. The commercial finite element (FE) analysis software ANSYS is used to simulate GW propagation in a wood utility pole. In order to verify the numerical findings, the laboratory testing is also conducted in parallel with the numerical results to experimentally verify the effectiveness of developed FE models. Finally, sensitivity analysis is also carried out based on FE models of wood pole under different material properties, boundary conditions and excitation types.

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“…An increase in the MOE and lowering of ρ results in a higher R value. Soundboards easily transmit vibrations to the edges and are good sound radiators and typically have a low ρ and high MOE with a high sound radiation ratio and tend to resonate lower frequencies much clearer and louder than other wood species (Yoshikawa, 2007 and2014).…”

Section: Introductionmentioning

confidence: 99%

Modifying the radiation ratio of tonewoods through wood degradation

Nefdt,

Meincken

2024

Preprint

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This work investigates different wood modification techniques to modify the acoustical properties of tonewoods, in particular the sound radiation ratio (R). The treatments used were heat- and fungal exposure, as well as immersion into NaOH and Na2SO3 solution and a combination of the most successful treatments. All initial experiments were performed on pine (Pinus patula) due to cost factors, before replicating the best performing treatment on high quality spruce tonewood (Picea abies). The main objective was to reduce the hemicellulose content without severely degrading cellulose, which results in a reduction of density, while maintaining, or even improving the elasticity (MOEL), which results in an increase of R. Overall, the combined heat-fungal and heat-sodium treatments performed best and increased R by up to 20%. Sodium treatment led to the best increases in R, but compromised the wood structure in spruce and the treatment protocol needs to be developed further. Consequently, the most successful wood treatment to improve acoustical properties was determined to be exposure to white rot combined with heat treatment.

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Propagation behavior of acoustic wave in wood

Cited by 13 publications

References 7 publications

Theoretical and experimental research on moisture content and wood property indexes based on nondestructive testing

Theoretical and experimental research on moisture content and wood property indexes based on nondestructive testing

Numerical Study on Guided Wave Propagation in Wood Utility Poles: Finite Element Modelling and Parametric Sensitivity Analysis

Modifying the radiation ratio of tonewoods through wood degradation

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